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Twinned Spell simply lets you target a second creature; it doesn't make you cast the spell twice. This is specifically stated in its description: [...] target a second creature in range with the same spell... Therefore you are only casting the spell once and only have to provide the material components once. And, even though Mike Mearls and (his) tweets ...


1

The Subtle Spell Metamagic can be applied through a familiar This is clear from the fact that you are still the one casting the spell, which is what Metamagic requires: [...] When you cast a spell, you can spend 1 sorcery point to cast it without any somatic or verbal components. [...] [...] Finally, when you cast a spell with a range of touch, your ...


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